Polymarket Whale Tracker

Polymarket Whale Tracker: every large trade on Polymarket, with the wallet behind it

Set a size threshold and you get one row per Polymarket trade at or above it, newest first: the market question, the outcome, the side, the USDC that changed hands, the fill price, the time, the transaction hash and the wallet that signed it. Narrow it to certain markets or wallets, and add the trader's current position or the market's biggest holders when you want the context. How far back you can see depends on the threshold, because Polymarket's public trade history stops at about 50 days and a low threshold fills your row cap long before that.

🔍 What Polymarket Whale Tracker does

Polymarket applies the size threshold itself, so smaller trades never reach you and are never charged. Each trade that does arrive is checked again on size, side and time window, and a fill seen twice comes back once.

Polymarket has no date filter, so sinceHoursAgo works by reading newest first and stopping once it is past your window. That is also why there is no "trades from last March" option: reaching it would mean paging through everything since. Measured on 19 September 2026, 10,000 trades at a $10,000 threshold covered about 15 days, and at $25,000 the 50-day limit came before the row cap did.

Markets can be Polymarket links, market slugs or condition ids, mixed. Wallets must be 0x addresses. A mistyped one is skipped and reported, never turned into a search of every market.

The two extras are looked up once per wallet and market, or once per market, and reused within the run. So one wallet's forty trades in one market take one extra lookup, not forty. Both make a run slower, and both are off unless you turn them on.

traderDisplayName and traderPseudonym are the labels Polymarket shows next to a wallet: a handle someone typed and a nickname the site generated. Neither is verified, and a wallet is not a person. This never tries to work out who a wallet belongs to. When Polymarket builds a "name" out of the address itself, the field is left null.

📥 What you give it

{
  "minTradeSize": 25000,
  "sizeBasis": "usdc",
  "sinceHoursAgo": 24,
  "maxTrades": 500
}

Following particular wallets, with their positions:

{
  "traders": ["0x67542c3219b37fd1610aad290676ff91cdbfe3bc"],
  "minTradeSize": 1000,
  "includeTraderPosition": true
}

📤 What you get back

A real row from a run on 29 September 2026:

{
  "tradedAt": "2026-09-29T13:26:48.000Z",
  "timestamp": 1790688408,
  "marketQuestion": "Dota 2: LGD Gaming vs Xtreme Gaming (BO3) - BLAST Slam Group A",
  "outcome": "LGD Gaming",
  "outcomeIndex": 0,
  "side": "BUY",
  "sizeUsdc": 30550.83,
  "shares": 45000,
  "price": 0.6789073733,
  "traderAddress": "0x1eeaf77002cf1eef5305abae702ddc3ccc86db08",
  "traderDisplayName": "110thst",
  "traderPseudonym": "Snoopy-Statin-Spool",
  "transactionHash": "0x6497570c8e9ec9f21666d247c17839d0e9db04329a546e682924d33a023b7054",
  "transactionUrl": "https://polygonscan.com/tx/0x6497570c8e9ec9f21666d247c17839d0e9db04329a546e682924d33a023b7054",
  "conditionId": "0xf5514cca9e1a1879e8901c35d33714d446a47613ed39eeab30166eee5c89a6f8",
  "tokenId": "104036161673518535467152916057562873523320038948071879753857499152088151012316",
  "marketSlug": "dota2-lgd-xtreme-2026-09-29",
  "eventSlug": "dota2-lgd-xtreme-2026-09-29",
  "marketUrl": "https://polymarket.com/event/dota2-lgd-xtreme-2026-09-29",
  "fetchedAt": "2026-09-29T13:27:49.321Z"
}

With the extras on, a row also carries these, shown here from two runs on 20 September:

{
  "traderPosition": {
    "shares": 13513.7,
    "avgPrice": 0.7299,
    "currentPrice": 0.725,
    "entryCostUsd": 9864.9874,
    "currentValueUsd": 9797.4325,
    "realizedPnlUsd": 0,
    "unrealizedPnlUsd": -67.5549,
    "totalPnlUsd": -67.5549,
    "percentPnl": -0.6847,
    "outcome": "Arman Tsarukyan",
    "redeemable": false
  },
  "marketTopHolders": [
    {
      "address": "0x224a89dbe0db0d6124b335edabd15b3f877da3d5",
      "displayName": "wr0ngw4yb3tt0r",
      "pseudonym": "Unwieldy-Supporter",
      "shares": 445858.326032,
      "outcomeIndex": 0,
      "avgPrice": 0.177,
      "currentValueUsd": 222.9291,
      "totalPnlUsd": -78732.3384
    }
  ]
}

🧾 Reading the output

The free sample row is a complete, real-looking trade, so no ordinary field tells it apart. Look for the flags:

There are no error codes. Every run also writes RUN_REPORT to its key-value store: what each search listed and returned, how many trades fell below the threshold or outside the window, which markets could not be found, and why the run stopped.

A run ends as Failed only when none of its searches could be read, when the run's price could not be read, or when your maximum charge does not cover a single trade. To keep only trades, drop every row carrying _sample or _diagnostic.

▶️ How to run it

1. Open Polymarket Whale Tracker and click Try for free. 2. Set Minimum trade size, and Measure the size in if you want shares instead of USDC. 3. Narrow it with Markets (optional) or Trader addresses (optional), and set Only trades from the last N hours. 4. Set Maximum trades, and tick the position or holder extras if you want them. 5. Click Start, then download the dataset as JSON, CSV or Excel, or read it from the API.

💰 How much does it cost?

$2.10 per 1,000 trades, flat on every Apify plan. The position and holder extras ride on the rows you already pay for and cost nothing more.

Not charged: the sample row, the diagnostic row, and trades below your threshold or outside your filters, since they never become rows. If you set a maximum charge for the run, it stops at the last trade that fits.

💡 What people use it for

• A feed of every fill over $25,000 in the last day, across all markets, in one spreadsheet.
• Following a handful of wallets you already track, with what each still holds after the trade.
• Checking who else holds a market before reading much into one big buy. A $60,000 buy looks

different from a wallet already holding half a million shares.

• Spotting long-odds swings, with sizeBasis: "shares" and a high share count.

🚧 What it does not do

• Nothing older than about 50 days. Earlier trades are still on the blockchain, but not in

Polymarket's public trade history, and no setting here reaches them.

• One row is one fill, not one order. A large order split across six counterparties is six rows.
• sizeUsdc is money moved, not conviction or profit. Selling a position is a large trade too.
• No order book, price history or market catalogue. Trades and holders only.
• No identity. Wallets, and the labels Polymarket shows, nothing more.
• No trading. It reads. There is no wallet or key here and no order placement.

🧭 Which prediction market scraper do you need?

❓ Questions people ask

Do I need a Polymarket account or an API key? No. Nothing to sign up for, and this asks you for no key.

What counts as a whale? You decide; that is what minTradeSize is. $10,000 is a sensible start.

Can I run it on a schedule? Yes, and sinceHoursAgo is built for it. Set the window a little longer than the schedule, say one hour every 15 minutes, so a slow run never leaves a gap. A trade seen by two runs comes back in both, so de-duplicate on the six fields a run uses itself: transactionHash, traderAddress, tokenId, side, shares and price.

Why do two rows share a transaction hash? One order can fill against several counterparties in the same transaction. Each fill is its own row, with its own size and price.

shares or usdc? usdc for who is moving real money. shares for who is taking a big swing at long odds, where the stake is small and the position is huge.

🆘 If something breaks

Open the Issues tab on the actor page. Send the input and the run ID; RUN_REPORT usually shows where the run stopped and why.